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《数学课程标准(2011年版)》强调学生通过数学学习不仅能获得基本的知识技能,更要获得基本的数学思想方法。转化思想是一种重要的数学思想,蕴涵在小学数学教材各知识领域中,在教学中需要教师渗透和学生感悟。最近我听了几个教师执教的“三角形的面积”这节课,值得欣慰的是教学中都体现了转化的思想和学生探究学习,但总觉得探究和转化还缺乏实效,现摘取几位教师关于三角形的面积计算公式推导的教学片断,谈谈我的想法。【片断描述】几位教师共同的做法是:在揭示课题后,让学生运用转化的方法自己推导出三
The Mathematics Curriculum Standard (2011 Edition) emphasizes that students not only acquire basic knowledge and skills through mathematics learning, but also acquire basic mathematical ideas and methods. The idea of transformation is an important mathematical thought, which is implicit in the knowledge fields of elementary mathematics textbooks. It requires teachers ’infiltration and students’ perception in teaching. Recently, I listened to several lectures given by teachers for the “Area of Triangles.” The good news is that both teaching and thinking have transformed students’ learning and learning. Several teachers deduced the teaching piece about the formula of area of the triangle and talked about my idea. [Fragment description] Several teachers common practice is: After revealing the subject, let the students use the method of conversion to derive their own three